JP2022180935A - Solid-state battery and manufacturing method of solid-state battery - Google Patents

Abstract

To provide a solid-state battery comprising a bipolar electrode plate, capable of reducing a lamination space factor of a solid electrolyte as well as reducing resistivity.SOLUTION: A solid-state battery comprises a lamination body formed by laminating a positive electrode plate, one or a plurality of bipolar electrode plates, and a negative electrode plate. In a lamination surface of the bipolar electrode plate, a solid electrolyte layer is formed. In at least one of an end surface of the bipolar electrode plate, the solid electrolyte layer is formed. The bipolar electrode plate is a plurality of bipolar electrode plates. In the end surface of each bipolar electrode plate, a concave part with the solid electrolyte layer and a convex part without the solid electrolyte layer are formed. It is preferable that the concave part and the convex part be alternately arranged between the adjacent bipolar electrode plates.SELECTED DRAWING: Figure 1

Description

The present invention relates to a solid state battery and a method for manufacturing a solid state battery.

Conventionally, lithium ion secondary batteries have been widely used as secondary batteries having high energy density. A lithium ion secondary battery has a structure in which a separator is present between a positive electrode and a negative electrode and filled with a liquid electrolyte.

Since the electrolytic solution of the lithium ion secondary battery is usually a combustible organic solvent, there have been cases where the safety against heat has become a problem. Therefore, a solid battery using an inorganic solid electrolyte instead of an organic liquid electrolyte has been proposed. For example, there has been proposed a technique related to a solid battery including a laminate having a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer (see Patent Document 1).

A solid battery using bipolar electrode plates also has a structure in which a solid electrolyte layer is laminated between bipolar electrode plates.

JP 2010-205479 A

In the solid battery described in Patent Document 1, a sheet-like solid electrolyte layer pressure-molded is arranged between each electrode layer. Since the sheet-like solid electrolyte layer requires strength, a thickness of about several tens of μm is required. For this reason, there is room for improvement in that the lamination space factor of the solid electrolyte increases and the resistivity increases as the distance between the electrodes increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a solid battery having a bipolar electrode plate that can reduce the lamination space factor of a solid electrolyte and reduce the resistivity.

(1) The present invention relates to a solid battery including a laminate obtained by laminating a positive electrode plate, one or more bipolar electrode plates, and a negative electrode plate, and a solid electrolyte is provided on the laminated surface of the bipolar electrode plate. It relates to a solid state battery in which layers are formed.

According to the invention of (1), it is possible to provide a solid battery including a bipolar electrode plate that can reduce the lamination space factor of the solid electrolyte and reduce the resistivity.

(2) The solid battery according to (1), wherein a solid electrolyte layer is formed on at least part of the end surface of the bipolar electrode plate.

According to the invention of (2), the insulation between the end surfaces of the bipolar electrode plates can be ensured.

(3) The bipolar electrode plate is a plurality of bipolar electrode plates, and concave portions in which the solid electrolyte layer is formed and convex portions in which the solid electrolyte layer is not formed are formed on the end faces of the bipolar electrode plates. The solid-state battery according to (1) or (2), wherein the concave portions and the convex portions are alternately arranged between the bipolar electrode plates.

According to the invention of (3), even when a thin solid electrolyte layer is formed on the electrode plate instead of the sheet-like solid electrolyte layer, insulation between the electrode plates can be ensured.

(4) In the bipolar electrode plate arranged adjacent to the positive electrode plate or the negative electrode plate, the concave portion is arranged at a position corresponding to an electrode tab extending from the positive electrode plate or the negative electrode plate, and The solid-state battery according to (3), which is wider than the width of the electrode tabs.

According to the invention of (4), the insulation between the end face of the bipolar electrode plate and the electrode tab extending from the positive electrode plate or the negative electrode plate can be ensured, and the solid electrolyte layer is formed on the positive electrode plate and the negative electrode plate. Since the laminated body can be formed without the need for the solid-state battery, the manufacturing process of the solid-state battery can be simplified.

(5) The solid battery according to any one of (1) to (4), wherein a solid electrolyte layer is formed on the laminated surfaces of the positive electrode plate and the negative electrode plate.

According to the invention of (5), it is possible to construct a laminate that can ensure insulation between the positive electrode plate, the negative electrode plate, and the end face of the bipolar electrode plate.

(6) The solid state according to any one of (1) to (5), wherein the bipolar electrode plate is a plurality of bipolar electrode plates, and the shapes of the bipolar electrode plates arranged adjacent to each other are mirror images of each other. battery.

According to the invention of (6), the shape of the bipolar electrode plate can be made suitable for ensuring insulation between the end surfaces of the bipolar electrode plate.

(7) The present invention also provides a method for manufacturing a solid-state battery including a step of manufacturing a bipolar electrode plate, wherein the manufacturing step of the bipolar electrode plate comprises coating one surface of a current collector plate with a positive electrode material, an electrode material coating step of coating the other surface with a negative electrode material; a hole drilling step of forming holes in a portion of the current collector coated with the electrode material; and the collector coated with the electrode material. A solid electrolyte coating step of coating a current plate with a solid electrolyte, and cutting the current collector plate coated with the electrode material along a cutting line including the hole, thereby and a cutting step of cutting the current collector plate so as to form a recess, in this order.

According to the invention of (7), a bipolar electrode plate having a solid electrolyte layer formed on at least a part of the end face can be efficiently manufactured, and the manufacturing cost of the solid battery can be reduced.

(8) In the manufacturing process of the bipolar electrode plate, the drilling step is a step of forming the holes so that adjacent rows of the holes are staggered. The method for producing a solid state battery according to (7), wherein the shaped bipolar electrode plate is produced.

According to the invention of (8), since the bipolar electrode plates having two different shapes which are mirror images of each other can be manufactured from one sheet-like collector plate, the manufacturing cost of the solid-state battery can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline|summary of the laminated body which concerns on 1st Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; FIG. 2 is a cross-sectional view taken along line BB of FIG. 1; FIG. 2 is a sectional view taken along line CC of FIG. 1; FIG. 2 is a cross-sectional view taken along line DD of FIG. 1; BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline|summary of the bipolar electrode plate which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline|summary of the bipolar electrode plate which concerns on 1st Embodiment of this invention. It is a figure which shows the outline|summary of the laminated body which concerns on 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view taken along line AA of FIG. 5; FIG. 6 is a cross-sectional view taken along line BB of FIG. 5; 6 is a cross-sectional view taken along line CC of FIG. 5; FIG. FIG. 6 is a cross-sectional view taken along line DD of FIG. 5; FIG. 5 is a diagram showing an outline of a bipolar electrode plate according to a second embodiment of the invention; FIG. 5 is a diagram showing an outline of a bipolar electrode plate according to a second embodiment of the invention; It is a figure which shows the manufacturing process of the bipolar electrode plate which concerns on 1st Embodiment of this invention. It is a figure which shows the manufacturing process of the electrode for solid batteries which concerns on 1st Embodiment of this invention. It is a figure which shows the manufacturing process of the bipolar electrode plate which concerns on 2nd Embodiment of this invention. FIG. 2 is a flow diagram showing manufacturing steps of the solid-state battery according to the first embodiment of the present invention; FIG. 5 is a flow diagram showing manufacturing steps of a solid-state battery according to a second embodiment of the present invention;

<<1st Embodiment>>
<Solid battery>
A solid battery according to this embodiment includes a laminate formed by laminating a positive electrode plate, a bipolar electrode plate, and a negative electrode plate. The laminate is housed in an exterior body, and the positive electrode plate and the negative electrode plate are electrically connected to the positive electrode and the negative electrode, respectively.

[Laminate]
As shown in FIGS. 1 and 2A to 2D, the laminate 1 according to the present embodiment has a positive electrode plate 20 and a negative electrode plate 30 arranged at both ends of the laminate, and between the positive electrode plate 20 and the negative electrode plate 30 In addition, two types of bipolar electrode plates 50a and 50b are alternately laminated.

(Positive plate)
As shown in FIGS. 2A to 2D, the positive electrode plate 20 includes a positive electrode collector plate 21, a positive electrode active material layer 22 containing a positive electrode active material formed on the positive electrode collector plate 21, and a positive electrode active material layer 22 on the positive electrode active material layer 22. and a positive electrode tab 211 formed by extending the positive electrode collector plate 21 .

The positive electrode current collecting plate 21 is not particularly limited, and is made of a known current collecting material that can be used for the positive electrode of a solid battery. For example, it is made of aluminum, aluminum alloy, stainless steel, nickel, iron, titanium, or the like.

The positive electrode active material forming the positive electrode active material layer 22 is not particularly limited, and a known material capable of intercalating and deintercalating a charge transfer medium such as lithium ions can be appropriately selected and used. Examples thereof include lithium cobaltate, lithium nickelate, lithium manganate, Li—Mn spinel substituted with a different element, lithium metal phosphate, lithium sulfide, and sulfur. Specifically, LiCoO ₂ , Li(Ni _5/10 Co _2/10 Mn _3/10 )O _{2 ,} Li(Ni _6/10 Co _2/10 Mn _2/10 )O _{2 ,} Li(Ni _8/10 Co1 _{/10Mn1 /10} ) _{O2 ,} Li( _{Ni0.8Co0.15Al0.05} )O2 _, Li(Ni1 _{/6Co4 / 6Mn1 /6} )O2 _, Li( Ni _1/3 Co _1/3 Mn _1/3 )O _{2 ,} LiCoO ₄ , LiMn ₂ O ₄ , LiNiO ₂ , LiFePO ₄ and the like. The positive electrode active material layer 22 may optionally contain a conductive aid, a binder, and the like in addition to the positive electrode active material.

(negative plate)
As shown in FIGS. 2A to 2D, the negative electrode plate 30 includes a negative current collector 31, a negative active material layer 32 containing a negative active material formed on the negative current collector, and a negative active material layer 32 on the negative active material layer 32. It has a solid electrolyte layer 40 containing the formed solid electrolyte, and a negative electrode tab 311 formed by extending the negative electrode current collector plate 31 .

The negative electrode active material forming the negative electrode active material layer 32 is not particularly limited, and a known material capable of intercalating and deintercalating a charge transfer medium such as lithium ions can be appropriately selected and used. For example, lithium transition metal oxides such as lithium titanate, transition metal oxides such as _TiO2 , _Nb2O3 and _WO3 , Si, _SiO , metal sulfides, metal nitrides, as well as artificial graphite, natural graphite, graphite , carbon materials such as soft carbon and hard carbon, and metallic lithium, metallic indium and lithium alloys. The negative electrode active material layer 32 may optionally contain a conductive aid, a binder, and the like in addition to the negative electrode active material.

(bipolar electrode plate)
As shown in FIGS. 2A to 2D, the bipolar electrode plates 50a and 50b have a positive electrode active material layer 22 formed on one surface of a collector plate 51 and a polarizable electrode on the other surface. This is an electrode plate formed with a negative electrode active material layer 32 that serves as the negative electrode of the . The configuration of the positive electrode active material layer 22 and the negative electrode active material layer 32 can employ the same configuration as described above. A solid electrolyte layer 40 containing a solid electrolyte is formed on the positive electrode active material layer 22 and the negative electrode active material layer 32 . The current collector plate 51 is not particularly limited, but examples thereof include stainless steel foil.

The solid electrolyte layer 40 is a layer having a thickness of about several μm formed on the positive electrode plate 20, the negative electrode plate 30, and the positive electrode active material layer 22 and the negative electrode active material layer 32 of the bipolar electrode plates 50a and 50b. Alternatively, it is a layer containing at least a solid electrolyte material that is a gel electrolyte. Charge transfer between the positive electrode active material and the negative electrode active material can be performed through the solid electrolyte material. The solid electrolyte material contained in the solid electrolyte layer 40 is not particularly limited, but for example, a sulfide solid electrolyte material, an oxide solid electrolyte material, a nitride solid electrolyte material, a halide solid electrolyte material, etc. can be used.

By forming the solid electrolyte layer 40 on the positive electrode active material layer 22 and the negative electrode active material layer 32, the thickness of the solid electrolyte layer 40 can be reduced to about several μm, thereby reducing the lamination space factor of the solid electrolyte. and the resistivity can be reduced. In addition, due to the configuration of the bipolar electrodes described below, the solid battery according to the present embodiment can ensure insulation between the electrodes while having a thin solid electrolyte layer, and has the advantage of simplifying the manufacturing process and structure. have.

The configurations of the bipolar electrode plates 50a and 50b are shown in FIGS. 3 and 4, respectively. 3 and 4 are diagrams of the bipolar electrode plates 50a and 50b, respectively, viewed from the lamination surface side on which the positive electrode active material layer 22 is formed. The shapes of the bipolar electrode plates 50a and 50b are mirror images of each other, with convex portions 51a and concave portions 52a alternately formed on the end faces. The solid electrolyte layer 40 is not formed on the end face of the projection 51a, and the solid electrolyte layer 40 is formed on the end face of the recess 52a. In the laminate 1, the bipolar electrode plates 50a and 50b are alternately laminated as shown in FIGS. 2A-2D. The number of stacked bipolar electrode plates 50a and 50b is not particularly limited as long as the bipolar electrode plates 50a and 50b are alternately stacked. When the bipolar electrode plates are simply stacked, securing insulation between the end surfaces becomes a problem. Insulation can be secured.

As shown in FIG. 1, the protrusions 51a and the recesses 52a of the bipolar electrode plates 50a and 50b are arranged alternately when viewed from the stacking direction. Further, the width of the concave portion 52a is wider than that of the convex portion 51a. As a result, as shown in FIGS. 1, 2A, and 2D, an insulation distance L1a can be secured between the protrusions 51a of the bipolar electrode plates 50a and 50b when viewed from the stacking direction, and insulation can be ensured when viewed from the stacking cross section. The distance L1b can be secured. The width of the concave portion 52a is not particularly limited, but can be, for example, wider than the width T1 of the positive electrode tab 211 and the negative electrode tab 311, and the width of the convex portion 51a can be, for example, narrower than the width T1.

Protrusions 51a or recesses 52a are formed on end surfaces of the bipolar electrode plates 50a and 50b. This ensures insulation between the concave portion 52 a and the end surfaces of the positive electrode plate 20 and the negative electrode plate 30 . In addition, as shown in FIGS. 2A, 2C, and 2D, between the end surfaces of the positive electrode plate 20 and the negative electrode plate 30, on which the positive electrode tab 211 and the negative electrode tab 311 are not arranged, and the convex portion 51a, when viewed from the laminated cross section, can ensure the insulation distances L2a and L2b. The insulation distance L2a is ensured by arranging the convex portion 51a on the outer peripheral side of the end surfaces of the positive electrode plate 20 and the negative electrode plate 30 .

In this embodiment, a bipolar electrode plate 50 a is provided adjacent to the positive plate 20 and the negative plate 30 . As shown in FIGS. 2A and 2C, the positive electrode tab 211 and the negative electrode tab 311 are formed with a solid electrolyte layer 40 having a certain length in the tab extending direction on the stacking surface. As a result, as shown in FIG. 1, an insulation distance L3a can be secured between the positive electrode tab 211, the negative electrode tab 311, and the convex portion 51a of the bipolar electrode plate 50a when viewed from the stacking direction. Furthermore, as shown in FIG. 2A, an insulation distance L3b can be secured between the positive electrode tab 211 and the convex portion 51a of the bipolar electrode plate 50b when viewed from the lamination cross section. Similarly, as shown in FIG. 2C, an insulation distance L3c can be secured between the negative electrode tab 311 and the convex portion 51a of the bipolar electrode plate 50a when viewed from the lamination cross section.

<Method for manufacturing solid-state battery>
As shown in FIG. 12, the solid-state battery manufacturing method according to the present embodiment includes a positive electrode plate manufacturing step S1, a bipolar electrode plate manufacturing step S2, a negative electrode plate manufacturing step S3, a stacking step S4, and a pressurizing step S5. and have

As shown in FIG. 12, the positive electrode plate manufacturing process S1 includes an electrode material coating process S11, a drying process S12, a solid electrolyte coating process S13, a drying process S14, and a cutting process 15 in this order.

The electrode material coating step S11 is, as shown in FIG. 10, a step of forming the positive electrode active material layers 22 on both sides of the sheet-like positive electrode current collector plate 21 . The method for forming the positive electrode active material layer 22 is not particularly limited, but for example, a method of preparing a positive electrode mixture containing a positive electrode active material and coating the positive electrode mixture on a positive electrode current collector can be mentioned. . The coating method is also not particularly limited, and examples thereof include a doctor blade method, spray coating, screen printing, and the like. The drying step S12 is a step of drying the applied positive electrode mixture, and the drying method is not particularly limited.

The solid electrolyte coating step S13 is, as shown in FIG. 10, a step of forming the solid electrolyte layers 40 on both sides of the sheet-like positive current collector plate 21 having the positive electrode active material layers 22 formed on both sides. A method for forming the solid electrolyte layer 40 is not particularly limited, and examples thereof include a method of applying a solid electrolyte by a doctor blade method, spray coating, screen printing, or the like, as in the electrode material coating step S11. The drying step S14 is a step of drying the applied solid electrolyte layer 40, and the drying method is not particularly limited.

The cutting step S15 is a step of forming the positive electrode tab 211 by cutting the sheet-like positive electrode current collector plate 21 into a predetermined size.

As shown in FIG. 12, the bipolar electrode plate manufacturing process S2 includes an electrode material coating process S21, a drying process S22, a drilling process S23, a solid electrolyte coating process S24, a drying process S25, and a cutting process 26. , in that order.

In the electrode material coating step S21, as shown in FIG. 9, a positive electrode active material layer 22 is formed on one surface of a sheet-like collector plate 51, and a negative electrode active material layer 32 is formed on the other surface. be. As a specific method, the same steps as the pole material coating step S11 and the pole material coating step S31 can be adopted. The drying step S22 is a step of drying the applied positive electrode mixture and negative electrode mixture, and the drying method is not particularly limited.

The hole making step S23 is a step of forming holes in the sheet-like current collector plate 51 having the positive electrode active material layer 22 and the negative electrode active material layer 32 formed on both sides thereof. The method of forming the hole is not particularly limited, and conventionally known methods such as a method of punching with a punching die and a method of laser processing can be used. As shown in FIG. 9, the drilling step S23 is preferably a step of forming holes such that adjacent rows of holes are staggered. Thus, from one sheet-like collector plate 51, bipolar electrode plates 50a and 50b having two types of mirror-image shapes can be manufactured.

In the solid electrolyte coating step S24, as shown in FIG. 9, a positive electrode active material layer 22 and a negative electrode active material layer 32 are formed on both sides of a sheet-like current collector plate 51 having holes formed therein. This is the step of forming the electrolyte layer 40 . The method of forming the solid electrolyte layer 40 is not particularly limited, and examples thereof include a method of applying a solid electrolyte by a doctor blade method, spray coating, screen printing, etc., as in the electrode material coating step S11 and the like. By applying a solid electrolyte to the current collecting plate 51 having the holes, the solid electrolyte flows around the end faces of the holes, and the solid electrolyte layer 40 can be formed also on the end faces of the holes. The drying step S25 is a step of drying the applied solid electrolyte layer 40, and the drying method is not particularly limited.

In the cutting step S26, the sheet-like current collector plate 51 is cut along a cutting line including the holes formed in the perforating step S23, thereby forming the bipolar electrode plate 50a and 50b is formed.

According to the bipolar electrode plate manufacturing step S2 including the above steps, the bipolar electrode plates 50a and 50b having the convex portions 51a and the concave portions 52a formed on the end surfaces and the solid electrolyte layer 40 formed on the end surfaces of the concave portions 52a can be manufactured. can. That is, before cutting the sheet-like collector plate 51, the end faces of the holes are coated with a solid electrolyte to manufacture the bipolar electrode plates 50a and 50b in which the solid electrolyte layer 40 is formed on at least a part of the end faces. This is preferable from the viewpoint of production efficiency of the bipolar electrode plates 50a and 50b.

As shown in FIG. 12, the negative electrode plate manufacturing process S3 includes, in this order, an electrode material coating process S31, a drying process S32, a solid electrolyte coating process S33, a drying process S34, and a cutting process . The negative electrode plate manufacturing step S3 is the same as the positive electrode plate manufacturing step S1 except that the negative electrode active material layers 32 are formed on both sides of the sheet-like negative electrode current collector plate 31 in the electrode material coating step S31. be.

In the stacking step S4, the positive electrode plate 20 manufactured in the positive electrode plate manufacturing step S1, the bipolar electrode plates 50a and 50b manufactured in the bipolar electrode plate manufacturing step S2, and the negative electrode plate 30 manufactured in the negative electrode plate manufacturing step S3. is a step of laminating the In the stacking step S4, the bipolar electrode plates 50a and 50b are alternately stacked, and the positive electrode plate 20 and the negative electrode plate 30 are arranged at both ends of the stack.

The pressing step S5 is a step of sandwiching and pressurizing the laminated positive electrode plate 20, the bipolar electrode plates 50a and 50b, and the negative electrode plate 30 with a press or the like to integrate them.

Other embodiments of the present invention will be described below. Descriptions of configurations similar to those described above may be omitted.

<<Second embodiment>>
[Laminate]
FIG. 5 is a diagram showing an outline of a stack 1a of a solid-state battery according to the second embodiment. As shown in FIGS. 5 and 6A to 6D, the laminate 1a has a positive electrode plate 20a and a negative electrode plate 30a arranged at both ends of the laminate, and two types of electrodes are arranged between the positive electrode plate 20a and the negative electrode plate 30a. It has a configuration in which bipolar electrode plates 50c and 50d are alternately laminated.

In this embodiment, as shown in FIGS. 6A to 6D, the solid electrolyte layer 40 is not formed on the stacking surfaces of the positive electrode plate 20a and the negative electrode plate 30a. Therefore, no solid electrolyte layer is formed on the surfaces of the positive electrode tab 211 and the negative electrode tab 311, either. Therefore, the manufacturing process of the laminate 1a can be simplified. On the other hand, in the laminate 1a, it is necessary to ensure insulation between the positive electrode tab 211 and the negative electrode tab 311 and the adjacent bipolar electrode plates.

The configurations of the bipolar electrode plates 50c and 50d are shown in FIGS. 7 and 8, respectively. 7 and 8 are diagrams of the bipolar electrode plates 50c and 50d, respectively, viewed from the lamination surface side on which the positive electrode active material layer 22 is formed. The shape of the bipolar electrode plates 50c and 50d is a shape having a mirror image relationship with each other, in which convex portions 51b and concave portions 52b are alternately formed on the end faces. Solid electrolyte layer 40 is not formed in convex portion 51b, and solid electrolyte layer 40 is formed in concave portion 52b. In the laminate 1a, the bipolar electrode plates 50c and 50d are alternately laminated as shown in FIGS. 6A-6D.

In this embodiment, the bipolar electrode plate arranged adjacent to the positive electrode plate 20a is the bipolar electrode plate 50c, and the bipolar electrode plate arranged adjacent to the negative electrode plate 30a is the bipolar electrode plate 50d. Therefore, the number of stacked bipolar electrode plates in this embodiment is an even number.

A concave portion 52b formed in the end face of the bipolar electrode plate 50c is arranged at a position corresponding to the positive electrode tab 211 having a width T1, as shown in FIGS. Similarly, the concave portion 52b formed in the end face of the bipolar electrode plate 50d is arranged at a position corresponding to the negative electrode tab 311 having the width T1, as shown in FIGS. The concave portion 52b is a concave portion wider than the width of the positive electrode tab 211 and the negative electrode tab 311, and the solid electrolyte layer 40 is formed on the end face. Thereby, insulation between the positive electrode tab 211 and the adjacent bipolar electrode plate 50c and insulation between the negative electrode tab 311 and the adjacent bipolar electrode plate 50d can be ensured.

As shown in FIGS. 5, 6A, and 6D, an insulation distance L1c can be secured between the protrusions 51a of the bipolar electrode plates 50c and 50d when viewed from the stacking direction, and an insulation distance L1b can be secured when viewed from the stacking cross section. can be secured.

As shown in FIGS. 5A and 5D , an insulation distance L2a and an insulation distance L2a and a L2b can be secured.

As shown in FIG. 5, an insulation distance L3d can be secured between the positive electrode tab 211 and the convex portion 51a of the bipolar electrode plate 50c when viewed from the stacking direction. The same applies to the negative electrode tab 311 and the convex portion 51a of the bipolar electrode plate 50d. Furthermore, as shown in FIG. 6A, an insulation distance L3b can be secured between the positive electrode tab 211 and the convex portion 51a of the bipolar electrode plate 50d when viewed from the lamination cross section. Similarly, as shown in FIG. 6C, an insulation distance L3c can be secured between the negative electrode tab 311 and the convex portion 51a of the bipolar electrode plate 50c when viewed from the lamination cross section. That is, recesses 52b having solid electrolyte layers 40 formed on end faces are provided at positions corresponding to the positive electrode tabs 211 and negative electrode tabs 311 of the bipolar electrode plate adjacent to the positive electrode plate 20a and the negative electrode plate 30a. As a result, even if the positive electrode plate 20a and the negative electrode plate 30a do not have the solid electrolyte layer 40, the insulation distances L3b, L3c, and L3d can be secured between them and the protrusions 51a of the respective bipolar electrode plates.

<Method for manufacturing solid-state battery>
As shown in FIG. 13, the solid-state battery manufacturing method according to the present embodiment comprises a positive electrode plate manufacturing step S1a, a bipolar electrode plate manufacturing step S2a, a negative electrode plate manufacturing step S3a, a stacking step S4, and a pressurizing step S5. and have

The positive electrode plate manufacturing step S1a and the negative electrode plate manufacturing step S3a are similar to the positive electrode plate manufacturing step S1 and the negative electrode plate manufacturing step S3 except that they do not include the solid electrolyte coating steps S13 and S33 and the drying steps S14 and S34. It is the same process as

The bipolar electrode plate manufacturing step S2a includes, as shown in FIG. , in that order. Each step of the bipolar electrode plate manufacturing step S2a is the same as the bipolar electrode plate manufacturing step S2 except that the hole drilling step S23a is different.

As shown in FIG. 11, the hole making step S23a is a step of forming holes in the sheet-like current collector plate 51 having the positive electrode active material layer 22 and the negative electrode active material layer 32 formed on both sides thereof. As a method for forming the holes, the same method as in the first embodiment can be adopted. As in the drilling step S23, the drilling step S23a is preferably a step of forming holes such that adjacent rows of holes are staggered, as shown in FIG. Thereby, from one sheet-like collector plate 51, the bipolar electrode plates 50c and 50d having two kinds of mirror-image shapes can be manufactured.

In the perforating step S23a, holes are formed in the current collector plate 51 so that two rows of bipolar electrode plates can be manufactured from one sheet-like current collector plate 51 along the flow direction of the sheet. The two rows of bipolar plates are manufactured such that adjacent bipolar plates are mirror images of each other.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the scope of the present invention includes those with appropriate modifications. The drilling step S23 of the bipolar electrode plate manufacturing step S2 according to the solid-state battery manufacturing method of the first embodiment will be described with reference to FIG. The drilling step S23a of the step S2a has been described with reference to FIG. Not limited to the above. The drilling process shown in FIG. 9 and the drilling process shown in FIG. 11 can be applied to both the drilling process S23 and the drilling process S23a, respectively.

1, 1a, 1b laminate 20, 20a, 20b positive electrode plate 211 positive electrode tab (electrode tab)
30, 30a, 30b negative electrode plate 311 negative electrode tab (electrode tab)
40 Solid electrolyte layer 50a, 50b, 50c, 50d Bipolar electrode plate 51a, 51b Convex portion 52a, 52b Concave portion

Claims (8)

A solid battery comprising a laminate obtained by laminating a positive electrode plate, one or more bipolar electrode plates, and a negative electrode plate,
A solid battery, wherein a solid electrolyte layer is formed on the laminated surface of the bipolar electrode plate. 2. The solid state battery according to claim 1, wherein a solid electrolyte layer is formed on at least part of the end face of said bipolar electrode plate. The bipolar electrode plate is a plurality of bipolar electrode plates,
An end face of the bipolar electrode plate is formed with a concave portion in which a solid electrolyte layer is formed and a convex portion in which a solid electrolyte layer is not formed,
3. The solid-state battery according to claim 1, wherein said concave portions and said convex portions are alternately arranged between said adjacent bipolar electrode plates. In the bipolar electrode plate arranged adjacent to the positive electrode plate or the negative electrode plate, the recess is arranged at a position corresponding to the electrode tab extending from the positive electrode plate or the negative electrode plate, and 4. The solid state battery of claim 3, wider than wide. 5. The solid state battery according to claim 1, wherein a solid electrolyte layer is formed on the laminated surface of said positive electrode plate and said negative electrode plate. 6. The solid-state battery according to claim 1, wherein said bipolar electrode plate comprises a plurality of bipolar electrode plates, and the shapes of said bipolar electrode plates arranged adjacent to each other are mirror images of each other. A method for manufacturing a solid-state battery, including a step of manufacturing a bipolar electrode plate,
The manufacturing process of the bipolar electrode plate includes:
an electrode material coating step of coating one surface of the current collector with a positive electrode material and coating the other surface with a negative electrode material;
a drilling step of forming a hole in a part of the current collector coated with the electrode material;
a solid electrolyte coating step of coating a solid electrolyte on the current collector coated with the electrode material;
A cutting step of cutting the current collector plate coated with the electrode material along a cutting line including the hole, thereby cutting the current collector plate so as to form a recess in the edge of the current collector plate. and , in this order. In the manufacturing process of the bipolar electrode plate, the drilling step is a step of forming the holes so that adjacent rows of the holes are staggered. 8. The method of manufacturing a solid state battery according to claim 7, wherein bipolar electrode plates are manufactured.

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